John Adedayo B. Adegboyega is a British actor, best known for playing Finn in Star Wars: The Force Awakens and its sequel Star Wars: The Last Jedi. He claimed to be 5'9" according to USA Today:

Quote:Given the characters involved, Abrams wanted the action between Finn and Kylo to be a dramatic conversation. Boyega found a rhythm in working with Driver, who had a distinct advantage in terms of physicality.

“Adam is way taller than me,” Boyega says. “I’m only 5-foot-9 and Adam is 6-foot-something, so my reach, my hold has to be pretty strong to take a blow from that dude when it comes to the sabers.”